Sealing tip for well casings



SEALING TIP FOR WELL GASINGS Filed July 19, 1944 Patented Oct. 26, 19484zfisafiet snALING TIP Fon WELL oA'srNGs Roy Jaswellfsmithfieldp.II..Application July i9, 1944,'seria1 N0;54`5,ses f 1 claim. (cries-e110)My invention relates to improvements in well y .casings particularly forthoseof the artesian well type although it is obvious that it may beemployed in other types of Wells.

An object of my invention is to provide. a seal-..

ing tip for well casings which may be detachably `secured to the lowerend of the pipe casting and `one which will positively shut olfsurfacelwat'er,

contaminated water, salt, sand and clay from upper levels from seepinginto the well near the upper end of the rock stratum to affect thequality of the water or other liquid being upwards in the well casing.

A further object of my invention is to provide a device of thisdescription which will positively seal off such impurities from theliquid being welled.

These and such other objects of my invention as may hereinafter .appearwill be best understood from a description of an embodiment thereof suchas is shown in the accompanying drawing.

In the drawings, Fig. 1 is a side elevation partially broken away of myimproved sealing tip for well casings.

Fig. 2 is a diagrammatic view showing in elevation my improved sealingtip detachably secured to the lower end of a well casing and showingadjacent strata o-f the earths surface around the well hole indiagrammatic section.

In the drawings, wherein like characters of I reference generallyindicate like parts throughout, I generally indicates a sealing tip forwell casings constructed in accordance with my invention.

As stated, my invention is particularly adapted for use with artesianwater wells. In drilling an artesian well of this type, the hole I2 isfirst drilled with a churn drill of a larger diameter than the wellcasing I4 usually about two inches larger. As the hole is beinginitially driven, a pipe of the diameter of the size of the drilled holeis simultaneously forced down the well hole l2 as the hole is made andthe material from the well is hailed out. After the hole I2 is drilled,a well casing I4 of smaller diameter than the first pipe usually ofabout two inches smaller diameter is inserted into well hole l2 to leavea peripheral space of one inch around the casing.

As it is impossible to insert the large pipe through the rock, a holewithout a pipe is drilled through the rock I6 thus providing the roughedges Ill on the portion of the hole I2 within the .rook stratum. haveshown in the drawings, a surface ground stratum 20, a gravel stratum 22,a sand stratum 24, and a rock stratum I6 which terminates abovethe'water `"stratum. 26. The

smaller well casing i4 `terminates near the'upper surface of the solidbed-rockstratum i6, 'and my invention. as stated, comprisesa sealing tiplvor the lower end'of -the Well casing I4 adapted to project within the'hole I2in therock stratum I6. f

My invention `comprises, a short pipelseetion 'Silo-r tip for vsaid wellcasing I4having an-upper end 32 adapted to be detachably secured to thelower end 34 of the pipe casing, in the embodiment shown, the upper endof the tip being threaded as at 36 for this purpose, and the lower endof the well casing I4 being threaded as at 38 for this purpose and aninternally threaded coupling ring 40 is provided to detachably couplethe threaded upper end of my improved sealing tip 32 to the lower end 34of the pipe casing I4. I employ the short pipe section 30 in order thatmy improved sealing member may be readily permanently rigidly secured tothe well easing to act as a positive seal to prevent the higherimpurities exterior of the well casing from coming into Contact with thelower liquid being welled.

I provide an annular resilient sealing member constructed of anysuitable relatively soft material such as rubber, synthetic rubber,gutta percha, synthetic resin, or otherwise, comprising the sleeve 42 ofsubstantial height permanently rigidly secured to the outer surface 44of the lower end of the pipe section 30 and having resilient sealingflanges or rings 46 projecting integrally radially outwardly from saidsleeve, said rings 4B being preferably axially spaced from each othersubstantial amounts as in the preferred embodiment shown and preferablyconstructed triangular in section so that each may terminate in anannular sealing ridge 48, said rings 46 being preferably spaced axiallyfrom each other amounts 50 substantially the radial height 52 of therings 46. Then if the tip 3D on the lower end of the casing I4 isinserted within the hole I2, which hole as stated is often provided indrilling with an irregular rough surface I8, it is obvious that certainof the rings 46 will completely ll up the indentations 54 in saidsurface I 8 and that where a projection 56 from said surface abuts aring 46 it may flatten it entirely against a flat land 5I] intermediatesaid rings 45 as at 58 as shown in Fig. 2. It is thus obvious thatcertain rings 46 so t in the depressions 54 and that other rings 46 areso flattened by the projections 56 to bear against the resilient lands50 that a positive resilient seal will be provided so that surfacewater, contaminated water, salt, sand, or clay will not seep downthrough the drilled hole exterior of said casing I4 through to theliquid being welled in the well casing. As shown, my improved seal comeswithin the upper end of the hole I8 and the rock stratum I6 completelyobstructing all downward passage of any fluid between the casing tip 30and surface I8 of said rock I6 thus positively Acutting oif al1 possibledownward seepage into the liquid being welled.

If desired, the sleeve 42 may be omitted and the resilient ringsvulcanized or otherwise ses cured to the pipe section 30 at the desiredspaced intervals forming the lands 50' on said pipe section betweenthem. With this construction, as the surface against which a rockprojection may abut is not resilient, not quite such an eicient seal isprovided.

It is apparent therefore that I provide the novel type of sealing tipfor well casing-s with the `advantages described above.

It is understood that my invention is not limited to the specificembodiment shown and describedand that various deviations may be madetherefrom without departing from the spirit and scope of the appendedclaim. i

What I claim is:

A sealing tip for use on well casings for sealing holes in bed rock,comprising a short `pipe REFERENCES CITED The following references areof record in the le of this patent:

UNITED STATES PATENTS Number Name Date 46,860 Moulton Mar. 14.-, 1865220,461 Eaton Oct, 7, 1879 250,929 Lewis Dec. 13, 1881 887,836 NewhouseMay 19, 1908 1,771,556 Cox 1 June 29J 1930 2,086,935 Cox July 13, 19372,265,615 Stalter Dec. 9, 1941

